Time　difference　of　arrival　(TDOA)　parameter　estimation　is　the　key　to　Three-satellite　interference　localisation.　Therefore,　in　order　to　improve　the　accuracy　of　Three-satellite　interference　location,　we　must　estimate　the　TDOA　parameter　accurately　and　effectively.　Based　on　the　study　of　wavelet　transform　correlation　TDOA　estimation　algorithm,　combining　with　correlation　and　Hilbert　subtraction　method,　we　put　forward　a　high　precision　TDOA　estimation　method　for　Three-satellite　interference　location.　The　proposed　algorithm　utilises　the　characteristics　of　the　zero-crossing　point　of　Hilbert　transform　method　corresponding　to　the　correlation　peak　point　of　correlation　method,　using　correlation　function　of　wavelet　transform　correlation　method　minus　the　absolute　value　of　its　Hilbert　transform,　to　sharpen　peak　point　and　improve　the　TDOA　estimation　precision,　so　that　the　positioning　is　more　accurate　and　effective.